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The death of the mutants made the whole battle situation change slightly, those mutants who were not afraid of death, their offensive actually had a slight pause, although it was only a slight pause, but it made Chu Hao keenly feel this, and then under the bombardment of a large number of anti-tank rocket artillery, the death line of the mutants who were already very close to the position was stretched a lot, which made everyone involuntarily relieved.

"Wow, two thousand reward points, after I go back, I can also redeem the huàn bloodline." Billis muttered almost with her eyes lit up, after this burst of hot weapon strafing, she was a lot more courageous, at least not the way she used to be.

Although he killed a level mutant, Chu Hao's expression still did not relax, the number of mutants who came this time was too many, even if it was a conservative estimate, the number of level mutants was at least about five, and only then did he kill one, judging from the mental power scan, he had already exhausted the high-end combat power of the Arctic Continent team, and then even if he tried his best, he would be able to kill one or two more at most, what was the use of this? Those level mutants are not afraid of heavy fire bullets at all, they can completely rush up, so that even if the position is broken, even if they retreat to the final line of defense, it is estimated that they will not be able to stop these level mutants for much time.

It's still more than an hour before dawn, and it's only four o'clock in the morning, at the very least, they have to resist these mutants for an hour, so that they can retreat when dawn comes, this hour...... It's like a year!

The situation at the scene can no longer help Chu Hao to think about anything, he can only continue to command the battle head-on, where to increase firepower, who needs to change weapons, when to use what heavy weapons, these things are all commanded by him in an orderly manner, at this time, even the sluggish team members, they all know that Chu Hao's command level is first-class, and it is estimated that only a powerful commander like him can command the battle in this situation in front of him.

But fortunately, in the next ten minutes or so, there was not a single level of mutants appeared, which also kept the death line still like that, and by now, the number of mutants who died had at least exceeded tens of thousands, and the specific number was definitely not counted, but it had already spread a thick layer of flesh and blood outside the position, and the smell of blood was so strong, as for making people really feel that this was in the Shura field.

And at this moment, Ao Qi suddenly spoke: "Chu Hao! The ammo base is only two points! ”

Chu Hao was stunned for a moment, and said silently: "Keep shooting, don't stop, listen to my orders!" ”

Aoqi nodded, and then continued to shoot, but everyone's hearts began to heavily, and the reason why it can be maintained now is because there is sufficient ammunition to support, once the ammunition is gone, then the next battle will be completely lost, everyone understands this truth, but what about understanding? That's the reality of the situation, you can only hold on.

Time passed second by second, mutants rushed to die, Zhang Heng's Ah Paqi had already stopped, Nian Xikong was seriously injured and was breathing, ammunition and weapons were about to run out, the fire suppression of the North Ice Continent team had come to an end, and even if those mutants died tens of thousands, the rest were still rushing towards everyone frantically.

"Time...... More of that! ”

It can be seen from the mental power scan that Robert Never is already crazy about the final test, and I don't know if it's a coincidence or time, his test ended just in the early morning when the sun was rising, so whether you want to hold on until dawn or get the antidote, you must stick to it again!

When everyone poured out another base of ammunition, at this time, there was a faint tremor on the ground, and everyone looked at each other with blank faces, because such a feeling only represented one thing...... A new class of mutants has appeared.

Nian Xikong still closed his eyes and breathed, Zhang Heng shrugged helplessly, his helicopter had long run out of ammunition, and he couldn't attack if he wanted to, not to mention, he didn't have a way to break the Gang Qi shield, even if he used bullet time, it was estimated that he couldn't break the defense at all.

Everyone looked at Chu Hao, and Chu Hao took a deep breath and said, "Billis, Aoqi, Sturry, Tom, Nian Xikong, you start to retreat, return to the final line of defense, and start stationing there, Zhang Heng, TIeR, you and I will continue to stay here until they have finished retreating." ”

Zhang Heng said helplessly: "Yes, yes, you are the boss, you have the final say." ”

TIeR, on the other hand, was expressionless, and very coolly continued to strafe around with two heavy machine guns.

In this way, everyone began to retreat, and when everyone went towards the passage gap, the firepower suddenly dropped a lot, and the mutants who were pressed down to poke their heads gradually felt this change, and under the leadership of some evolved mutants, a large number of mutants began to come madly, rushing towards the fire point desperately.

The whole scene looks extremely thrilling, the ground around it has already been covered with corpses and flesh, and the surrounding area is densely packed with mutants, they are roaring, noisy, crazy, desperately rushing towards everyone, and the firepower can no longer achieve a continuous blockade, although most of the mutants have been killed, but there are also a few mutants who have slipped through the net to pounce on them.

In fact, this may be the instinct of the creature, the mutant intelligence may not be bright, but the instinct of the creature is still there, that is, they feel that they are stronger than humans, in the past few years, the mutants and the surviving humans who have not escaped to the mountains must have fought each other, they naturally know that the firearm is really a big threat to them, but the firearm that does not form a group firepower, how can it be possible to fight the mutant in such a complex environment as the city? Besides, the numerical advantage is on the side of the mutants, so the simple heads of the mutants probably remember one thing, when they are close, humans are food.

There were only a dozen mutants who approached first, and they rushed close to the front TIeR, while Chu Hao and Zhang Heng continued to strafe around with unchanged expressions, and the first one of these mutants had already roared and jumped straight up, trying to jump on TIeR's head and bite him to death.

Seeing that TIeR didn't retreat at all, he rushed up and raised the crane gun to fire nearby, and in the sound of bullets, the mutant had been beaten to minced meat, but at the same time, several other mutants rushed up, one of the mutants rushed directly in front of TIeR, grabbed TIeR's hand with one hand, and tried in vain to lift TIeR up.

But is that easy? Lifting TIeR failed, but was lifted up by TIeR, and then I saw TIeR throw down the heavy machine gun, and tear it directly with both hands, tearing the mutant into two, and at the same time holding the corpse of the mutant that was torn into two, as if holding two weapons, swept left and right, and at the same time kicked hard with his feet, and a mutant was about to be kicked through the chest, flying out more than ten meters away, and he must be dead.

In just over a few minutes, these dozen or so mutants were directly killed by TIeR, but that's it, and then Chu Hao was heard shouting the word retreat, and TIeR picked up two heavy machine guns from the ground, and ran backwards while strafing.

And Chu Hao and Zhang Heng on the position, they also hurriedly ran towards the big gap in the research institute, but before running, Chu Hao put the time bomb that had been set before in the ammunition pile, and then the two hurriedly rushed into the underground of the research institute along the rope ladder, followed by TIeR also jumped down from top to bottom, and the three of them immediately ran towards the depth of the research institute, and it was only a minute to run out, and there were 6 mutants rushing down from the gap behind them, but they only rushed down so much, Immediately afterwards, a violent explosion came from the opening, and the entire research institute was trembling violently, this tremor lasted for a long time, in fact, Chu Hao and the others felt that their ears were almost deaf, but when the trembling stopped, they still ran forward frantically, and behind them, those mutants who jumped off the gap, some of them who were still alive also began to pursue behind them.

The number of these mutants who are still alive is only about hundreds, and their degree is extremely fast, and they are also running forward quickly in the underground of this research institute, but before they can rush close to Chu Hao and the others, then there is a fierce sound of gunfire from a distance, and these hundreds of mutants are immediately attacked by gunshots, and in only a few seconds before and after, they have been pierced and died.

In front of Chu Hao and the others, Tom and Aoqi were holding weapons to strafe this side, and at the gate of the closed area, the final defense line was built on the basis of this huge metal gate.

In fact, the closed area of this research institute, especially its gate, is made of the most advanced alloy, although it cannot compete with those anti-nuclear bases, and cannot resist tactical nuclear bombs or anything head-on, but this alloy gate is also enough to resist all kinds of conventional missiles, relying on this gate to build the last line of defense, because the number of mutants in one time is not large, so it is more tenacious than the defense line outside the research institute...... I just don't know what happened to the confrontation-level mutants.

Chu Hao and the other three rushed to the front, and Chu Hao immediately said: "The gap has collapsed, but those mutants are estimated to dig down the passage, we only have a little time to rest, check all the weapons again, put the ammunition in close quarters, aim at the end of this passage, as long as any mutants appear, immediately gather fire and attack, insist!" It's less than an hour until dawn! ”

Everyone immediately began to check their weapons and ammunition, at this moment in this final line of defense, in addition to heavy weapons, weapons are more strong penetrating weapons, such as the remaining metal storm, such as anti-materiel sniper rifles, etc., because the terrain here restricts the number and movement of mutants, so strong penetrating weapons are more effective.

Everyone was waiting silently, occasionally one or two violent breaths, everyone seemed to be able to hear their own heartbeat, it was so quiet, the whole institute ...... It's so quiet.

At this moment, there was a violent tremor from the ceiling of the research institute outside the enclosed area, followed by a large piece of metal falling from the sky, and before everyone could see anything clearly, a large number of mutants came out of it like rats, then the second ceiling fell, and the third, and the fourth......

"Fire!"

Chu Hao roared loudly, and the heavy machine gun in his hand had already roared angrily......